Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab5529b96d96706…

MALICIOUS

PDF

47.9 KB Created: 2020-08-03 09:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4e2ade0c9fb8fbba0d64007b8d78f18 SHA-1: 9c89d5073ab1b403f048a9d5d91c58a79f9b9ca9 SHA-256: 4ab5529b96d9670663ce9055c3d0dbc47b92f652660696edc8a029b95b9352c3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to a known malicious redirector service, 'ttraff.cc', which is likely used to obscure the final destination of the attack. Another heuristic identified a large 'SEO link farm' pattern, with many links pointing to PDFs hosted on Shopify domains, suggesting a coordinated effort to distribute malicious content. The presence of these link farms and the redirector points to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=sigma+alt+code
    • http://files.halal-enterprises.com/uploads/1/3/1/3/131398250/kigabepef_rinabusigesu_tazike.pdf
    • http://files.nickosharizanos.com/uploads/1/3/1/4/131409574/veburaduxuvugogewox.pdf
    • http://files.catholicfamilycelebrations.com/uploads/1/3/0/7/130740051/kojelexawifaxisesow.pdf
    • http://files.tludramaticmedia.com/uploads/1/3/1/3/131383380/lijapenirubijib.pdf
    • http://files.myccclive.com/uploads/1/3/1/8/131871535/456dd7e.pdf
    • https://cdn.shopify.com/s/files/1/0431/9330/3199/files/safulexiluviji.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/99514797765.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53681635306.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/11123284284.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/9113830302.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/walter_savitch._absolute_c._6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/movie_wav_files.pdf
    • https://cdn.shopify.com/s/files/1/0449/8269/8142/files/amazon_delete_saved_for_later.pdf
    • https://cdn.shopify.com/s/files/1/0431/6790/8004/files/nupal.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/gojujekujudijulil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/2667839588.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f20.bin
3d4a4418c5aa9ca6641c8fc4105a77802a3a192c45ddca3647c9a41c30969776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 5088 bytes
font_01_sfnt_off00007053.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7053 1800 bytes
font_02_sfnt_off000078e1.bin
15daaa0783d987eaa1264f24486a0e39a144b9c03ef37c879b844ac78bce2bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 10448 bytes
font_03_sfnt_off00009ccf.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCF 16312 bytes

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